Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4826
PUT
Olin
OLN
$1.76B
| $182K | ﹤0.01% |
9,200
+6,600
| +254% | +$173K |
|
4827
CALL
Oceaneering
OII
$4.4B
| $182K | ﹤0.01% |
4,500
-27,900
| -86% | -$1.05M |
|
4828
Avery Dennison
AVY
$12.9B
| $182K | ﹤0.01% |
1,123
+975
| +659% | +$159K |
|
4829
CALL
Jack in the Box
JACK
$258M
| $182K | ﹤0.01% |
11,500
+9,200
| +400% | +$113K |
|
4830
CALL
Buckle
BKE
$2.23B
| $181K | ﹤0.01% |
4,300
+400
| +10% | +$19.8K |
|
4831
PUT
Sensata Technologies
ST
$6.1B
| $181K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$163K |
|
|
LB
4832
LandBridge Co
LB
$2.39B
| $181K | ﹤0.01% |
+2,289
| New | +$157K |
|
4833
EOG Resources
EOG
$73.3B
| $181K | ﹤0.01% |
1,394
-3,242
| -70% | -$442K |
|
4834
PUT
Brookfield Renewable
BEP
$8.4B
| $181K | ﹤0.01% |
5,200
+2,200
| +73% | +$76.4K |
|
4835
CALL
Global Net Lease
GNL
$1.93B
| $181K | ﹤0.01% |
20,200
-5,100
| -20% | -$47.7K |
|
|
RVI
4836
PUT
Robinhood Ventures Fund I
RVI
$750M
| $180K | ﹤0.01% |
+5,500
| New | +$209K |
|
|
EMA
4837
CALL
Emera Inc
EMA
$14.7B
| $180K | ﹤0.01% |
3,400
+3,300
| +3,300% | +$173K |
|
4838
CALL
KBR
KBR
$4.43B
| $180K | ﹤0.01% |
5,200
+4,900
| +1,633% | +$171K |
|
4839
Atlas Lithium Corp
ATLX
$74M
| $180K | ﹤0.01% |
48,660
-65,106
| -57% | -$290K |
|
4840
PUT
Philips
PHG
$24.2B
| $179K | ﹤0.01% |
6,600
-245
| -4% | -$6.49K |
|
4841
MacroGenics
MGNX
$240M
| $179K | ﹤0.01% |
38,821
+34,057
| +715% | +$129K |
|
|
AVR
4842
PUT
Anteris Technologies
AVR
$740M
| $179K | ﹤0.01% |
18,200
+8,200
| +82% | +$62.4K |
|
4843
PUT
Crown Holdings
CCK
$11.6B
| $179K | ﹤0.01% |
1,600
+1,100
| +220% | +$111K |
|
|
ABX
4844
CALL
Abacus Global Management
ABX
$788M
| $179K | ﹤0.01% |
16,700
+3,800
| +29% | +$34.7K |
|
4845
CALL
Standex International
SXI
$3.36B
| $179K | ﹤0.01% |
500
+400
| +400% | +$112K |
|
4846
Goosehead Insurance
GSHD
$1.05B
| $179K | ﹤0.01% |
+3,686
| New | +$152K |
|
4847
PUT
Allot
ALLT
$416M
| $179K | ﹤0.01% |
20,200
+20,000
| +10,000% | +$149K |
|
4848
Larimar Therapeutics
LRMR
$326M
| $179K | ﹤0.01% |
+58,608
| New | +$233K |
|
4849
CALL
Palladyne AI
PDYN
$258M
| $179K | ﹤0.01% |
29,400
+5,200
| +21% | +$34.4K |
|
4850
Telus
TU
$12.9B
| $179K | ﹤0.01% |
+16,911
| New | +$206K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.